Wave power generation and air turbine device and design method thereof

Abstract

The invention discloses a wave power generation and air turbine device and a design method thereof.The wave power generation and air turbine device comprises a middle flow channel internally provided with movable blades, a first airflow flow channel internally provided with first guide blades and a second airflow flow channel internally provided with second guide blades, and the first airflow flow channel extends from one side of each movable blade to be communicated with the atmosphere; the second air flow channel extends from the other side of the movable blade to be communicated with the air chamber; the reduction ratio of the first air flow channel is smaller than that of the second air flow channel; air flow can enter the floating body air chamber from the external environment and enter air from the floating body air chamber, and the air flow is not completely consistent under the two working modes of the air turbine, so that the reduction ratios of the first air flow channel and the second air flow channel are different, the speed and pressure of the air flow can be better controlled, the flowing of the air flow is optimized, and the service life of the air turbine is prolonged. And the overall efficiency of the system is improved.

Description

Technical Field

[0001] The invention relates to the technical field of wave energy power generation, in particular to a wave energy power generation, air turbine device and a design method thereof. Background Art

[0002] The existing wave energy power generation technology routes mainly include oscillating float type, oscillating water column type and overboard type. Among them, the rear-bend oscillating water column wave energy power generation device is considered to be one of the wave energy power generation devices with the most commercial prospects due to its high efficiency, high reliability and low construction cost.

[0003] The rear-bend pipe oscillating water column wave energy power generation device is mainly composed of a rear-bend pipe float, an air turbine, and a generator. When the water level in the air chamber rises, the pressure in the air chamber is higher than the ambient pressure, and the airflow flows from the air guide volute to the air turbine and then discharged into the environment; when the water level in the air chamber drops, the pressure in the air chamber is lower than the ambient pressure, and the airflow reverses, flowing from the air turbine through the air guide volute and into the air chamber. Under the two airflow directions, the design of the air turbine guide vanes and moving blades can realize the unidirectional rotation of the turbine rotor. The float captures the wave energy and converts it into air energy in the air chamber. The air in the air chamber is further converted into the mechanical energy of the turbine rotor by blowing the air turbine to rotate. The generator receives the mechanical energy of the turbine shaft and converts it into electrical energy to achieve power generation.

[0004] For example, patent announcement number CN117052588B "An oscillating water column wave energy power generation device" has an S-shaped rotating cross-section airflow duct design. On the incoming flow side, the duct changes from wide to narrow along the airflow direction, and on the outflow side, the duct changes from wide to narrow along the airflow direction. As the airflow flows inward, it is accelerated, and the high-speed airflow impacts the moving blade group, driving the high-speed rotation of the rotor, and finally driving the external power generation equipment to generate electricity, thereby better realizing energy conversion, reducing energy loss, and improving the overall efficiency of the device;

[0005] However, when the water level rises, the air pressure in the floating chamber increases, the gas is compressed, the density increases, and the volume flow rate decreases; when the water level drops, the air pressure in the floating chamber decreases, the gas expands, the density decreases, and the volume flow rate increases. This floating may cause the movement of the power generation device to be unstable, thus affecting the stable conversion of energy.

[0006] At the same time, due to the periodicity of waves and the ever-changing sea wave conditions, the air energy in the floating air chamber fluctuates greatly. When the airflow input torque is too large, the generator will be at risk of burning, and the turbine and main structure may break and fail. In addition, the periodic reciprocating airflow causes the air turbine to be in non-design conditions for a long time. Summary of the invention

[0007] The object of the present invention is to provide a wave energy power generation, air turbine device and design method thereof to solve the problems raised in the above background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A wave energy power generation air turbine device comprises a middle flow channel with built-in moving blades, a first air flow channel with built-in first guide vanes, and a second air flow channel with built-in second guide vanes, wherein the first air flow channel extends from one side of the moving blades to communicate with the atmosphere, and the second air flow channel extends from the other side of the moving blades to communicate with an air chamber;

[0010] The flow channel area of ​​the first airflow channel decreases from the first guide vane to the moving blade, and the reduction ratio is set to a;

[0011] The flow channel area of ​​the second airflow channel decreases from the second guide vane to the moving blade, and the reduction ratio is set to b;

[0012] The reduction ratio a is smaller than the reduction ratio b.

[0013] The reduction ratio a is 0.2 to 0.5 less than the reduction ratio b, wherein the reduction ratio a is between 2 and 3, and the reduction ratio b is 0.2 to 0.5 greater than the reduction ratio a. The first airflow channel and the second airflow channel are designed by the equal circulation principle, the channel height remains unchanged, and the area changes evenly.

[0014] Preferably, the moving blades are arranged axially horizontally.

[0015] Preferably, the first airflow channel comprises a first lateral channel and a first vertical channel which are connected, and the first lateral channel extends in the same direction as the middle channel and is connected;

[0016] A Bezier curve or an arc line is used to transition between the first transverse flow channel and the first vertical flow channel;

[0017] The second airflow channel comprises a second lateral channel and a second vertical channel connected to each other, and the second lateral channel extends in the same direction as the middle channel and is connected to each other;

[0018] A Bezier curve or an arc line is used to transition between the second transverse flow channel and the second vertical flow channel.

[0019] Preferably, the first guide vane is installed at a straight section of the first vertical flow channel; and the second guide vane is installed at a straight section of the second vertical flow channel.

[0020] Preferably, the same-direction ends of all the second airflow channels are communicated with the air chamber through a guide volute.

[0021] Preferably, the equal area of ​​the guide volute decreases from the end close to the air chamber to the turbine end, and the reduction ratio does not exceed 0.6.

[0022] Preferably, positive and negative pressure relief protection valves are installed on the guide volute or the air chamber.

[0023] Preferably, the concave portion of the guide volute is lower than the middle flow channel and is equipped with a drainage air-locking valve.

[0024] Preferably, the intermediate flow channel is arranged with equal area along the flow direction of the airflow, and the axial length of the intermediate flow channel is 3-10 times the blade height of the moving blade; the moving blade adopts a left-right symmetrical impact blade shape, and the blade angle of the moving blade from the blade root to the blade height is designed to change with the airflow angle at the moving blade inlet.

[0025] Preferably, the first guide vane and / or the second guide vane are / is designed in an elliptical arc, and the arrangement time interval of the first guide vane and / or the second guide vane is adjustable.

[0026] A design method for a wave energy power generation air turbine device comprises the following steps:

[0027] The initial incident angle of the inflow at the guide vane inlet is a1, and the airflow angle changes to a2 after being guided by the guide vane;

[0028] a2=θ+a1;

[0029] θ = arcsin(p / t);

[0030] Where t is the guide vane spacing in the airflow channel, p is the throat width, and θ is the change in airflow angle from the guide vane inlet to the throat position;

[0031] Vt2=c*Vt;

[0032] a2 = arc tan (Vt2 / Vu2);

[0033] Wherein, Vt is the normal velocity of the airflow at the equal lobe height, Vu is the circumferential velocity of the airflow at the equal lobe height, c is the reduction ratio of the airflow channel; Vt2 is the normal velocity of the airflow after passing through the reduced airflow channel;

[0034] The circumferential velocity Vu2 of the airflow after it flows through the reduced airflow channel is calculated according to the equal annular volume formula;

[0035] The blade angle of the moving blade is 0 to 2 degrees larger than the airflow angle a2

[0036] A wave energy power generation device comprises a generator, a rear curved pipe float and a wave energy power generation turbine device, wherein the generator is connected to one end of the rotating shaft of the moving blade, and the air chamber of the rear curved pipe float is connected to the air turbine device.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The airflow can enter the float chamber from the external environment and also enter the air from the float chamber. In the two working modes of the air turbine, the airflow is not completely consistent. Therefore, the reduction ratios of the first airflow flow channel and the second airflow flow channel of the present invention are different, so that the airflow speed and pressure can be better controlled, the flow of the airflow can be optimized, and the overall efficiency of the system can be improved.

[0039] By reducing the number of turns of the first airflow channel and the second airflow channel, flow separation in the corresponding channels is reduced, thereby reducing flow loss.

[0040] The guide vanes are designed with elliptical arcs, and the width of the guide vanes can be adjusted when arranged, so that the angle of the airflow out of the throat can be effectively controlled under different wave conditions, matching the angle of the moving blades, and maintaining high-efficiency operation of the system.

[0041] By installing a drain and air-locking valve at the bottom of the guide volute, the accumulated water can be discharged in time to prevent the accumulated water from entering the moving blades and causing damage to the blades.

[0042] When encountering severe sea conditions, the flow pressure in the air chamber exceeds the design value of the turbine power generation system. The system is equipped with positive and negative pressure relief valves to maintain the air flow pressure inside the power generation system below the safety threshold. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0044] Figure 1 This is a schematic diagram of the wave energy power generation structure of the present invention;

[0045] Figure 2 It is a schematic diagram of the structure of the air turbine device of the present invention;

[0046] Figure 3 It is a cross-sectional view of the air turbine device, air chamber and guide volute of the present invention;

[0047] Figure 4 It is a schematic diagram of the coordination of the first and second air flow channels and the middle flow channel of the present invention;

[0048] Figure 5 It is a schematic diagram of the moving blade of the present invention;

[0049] Figure 6 This is a schematic diagram of the guide vane arrangement of the present invention;

[0050] Figure 7 It is the variation trend curve of the flow passage area from the environment side to the air chamber of the present invention.

[0051] The reference numerals in the figure are as follows:

[0052] 100, generator; 200, air turbine device; 300, air chamber; 400, floating chamber; 500, rear bend pipe float;

[0053] 201, intermediate flow channel; 202, moving blade; 203, first guide vane; 204, first air flow channel; 205, second guide vane; 206, second air flow channel; 207, guide volute; 208, drainage air-blocking valve. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] Example:

[0056] A wave energy power generation device, as shown in the following Figure 1 As shown, a rear-bend pipe oscillating water column wave energy power generation device is adopted, which mainly includes a rear-bend pipe floating body 500, an air turbine device 200 and a generator 100. A floating chamber 400 is arranged above the top of the rear-bend pipe floating body 500, and an air chamber 300 is arranged at the upper end of the rear-bend pipe floating body 500; one end of the air turbine device 200 is connected to the air chamber 300, and the other end is connected to the atmosphere;

[0057] The generator 100 receives the mechanical energy of the rotating shaft of the air turbine device 200 and converts it into electrical energy to generate electricity.

[0058] A wave energy power generation air turbine device, such as Figure 2-7 As shown, it includes a turbine body and a guide volute 207, and a first airflow channel 204, an intermediate channel 201 and a second airflow channel 206 which are connected in sequence are arranged in the turbine body; the free end of the first airflow channel 204 is connected to the atmosphere, and the other end of the second airflow channel 206 is connected to the air chamber. In order to meet the requirements of bidirectional flow, increase the gas flow velocity at the moving blade 202 (intermediate channel 201) and reduce the flow loss at the front and rear guide vanes, the contours and reductions of the first airflow channel 204 and the second airflow channel 206 are designed based on the principle of equal annular volume, and the uniform transition of the area and the minimum number of airflow turns are achieved by optimizing the flow channel curve;

[0059] The guide volute 207 is of equal area or slightly reduced from the air chamber end to the turbine end, and the reduction ratio does not exceed 0.6. The guide volute 207 serves as a transition, making the airflow more uniform before entering the air turbine device 200, ensuring smooth airflow in this part and reducing flow separation.

[0060] The moving blade 202 is rotatably supported in the turbine body, and the moving blade 202 is arranged horizontally in the axial direction; the moving blade 202 includes a rotating shaft and a moving blade group that causes the rotating shaft to rotate, one end of the rotating shaft extends out of the turbine body and is connected to the generator 100, and the moving blade group is located in the middle flow channel 201 in the turbine body. The moving blade group of the moving blade 202 is installed in the middle flow channel 201 of the straight pipe section to facilitate welding and flow channel gap control; Figure 5 As shown, the moving blade 202 adopts a bilaterally symmetrical impact blade shape, and the blade angle from the blade root to the blade tip is adjusted according to the airflow velocity, and the flow area of ​​the moving blade is kept uniformly increased and decreased. When rotating, the radius at the blade root is small, the radius at the blade tip is large, and the rotation angular velocity is the same, which causes the blade root rotation linear velocity to be smaller than the blade tip rotation linear velocity. By matching the inflow velocity under the shape of the front flow channel and calculating the angle between the inflow velocity and the rotation linear velocity, the blade angle from the blade root to the blade tip can be matched with the incident airflow angle.

[0061] The first guide vane 203 and the second guide vane 205 are designed with an elliptical arc, and each first guide vane 203 is installed in the first airflow channel 204 through a one-to-one corresponding adjustment component, so that the relative position of the first guide vane 203 in the first airflow channel 204 can be adjusted. The adjustment component can be driven by a screw. When the first guide vane 203 and the second guide vane 205 are arranged, the distance between adjacent guide vanes can be adjusted, so that the airflow angle out of the throat can be effectively controlled under different wave conditions, and the angle of the blade 202 can be matched to maintain the high-efficiency operation of the system. The design of the second guide vane 205 is no longer repeated.

[0062] The first air flow channel 204 and the second air flow channel 206 are both rotary structures. Figure 3 As shown on the right side of the dotted line, the first airflow channel 204 and the second airflow channel 206 in the cross-sectional state form an I-shaped structure.

[0063] like Figure 4 As shown, the first airflow channel 204 includes a first lateral channel and a first vertical channel connected to each other. The first lateral channel is consistent with the extending direction of the middle channel 201 and is connected. The first guide vanes 203 are relatively installed in the first vertical channel. The free ends of the first vertical channels of all the first airflow channels 204 are connected to the atmosphere. The first guide vanes 203 are installed away from the moving blades 202 and the channel is straight (not at the bend) and has a wide area. The flow velocity at this position is small, which can effectively reduce the flow separation at the first guide vanes 203. Through the above design, the efficiency can be improved to more than 60%.

[0064] A Bezier curve or an arc line is used to transition between the first transverse flow channel and the first vertical flow channel;

[0065] The second airflow channel 206 includes a second lateral channel and a second vertical channel connected to each other. The second lateral channel is connected to the middle channel 201 in the same extension direction. The second guide vane 205 is relatively installed in the second vertical channel. The second guide vane 205 is installed away from the moving blade 202 and the channel is straight (not at the bend) and has a wide area. The flow velocity at this position is small, which can effectively reduce the flow separation at the second guide vane 205. Through the above design, the efficiency can be improved to more than 60%. The other end of the second vertical channel of all second airflow channels 206 is connected to the air chamber 300 through the guide volute 207.

[0066] A Bezier curve or an arc line is used to transition between the second transverse flow channel and the second vertical flow channel.

[0067] The airflow can enter the air chamber 300 from the external atmosphere through the first airflow channel 204, the middle channel 201, the second airflow channel 206 and the guide volute 207 in sequence; during this process, the water level drops, the air pressure in the floating air chamber decreases, the gas expands, the density decreases, and the volume flow rate increases;

[0068] It can also flow in the opposite direction from the air chamber 300 into the external atmosphere; in this process, the water surface rises, the air pressure in the floating air chamber increases, the gas is compressed, the density increases, and the volume flow rate decreases. Therefore, the air flow is not completely consistent in the two working modes of the air turbine device 200.

[0069] like Figure 4 As shown, the number of turns is reduced to 2, and the flow separation in the corresponding flow channel is reduced.

[0070] In order to match the difference in air volume flow rate between the two working modes, such as Figure 4 As shown, the contraction ratio b (S4 / S3) of the second air flow channel 206 near the air chamber end is greater than the contraction ratio a (S1 / S2) of the first air flow channel 204 near the air end. S1-S4 represents the area of ​​the flow channel at this position.

[0071] In addition, the flow channel area change rate is zero before entering the moving blade 202, and the airflow enters the moving blade 202 after a transition through a section of equal-area pipe, so that the airflow angle is well matched with the moving blade 202 and the loss is minimized. Therefore, an equal-area intermediate flow channel 201 is designed, and the moving blade group of the moving blade 202 is located in the intermediate flow channel 201.

[0072] The two sections of transition flow channels before and after the moving blade 202 start from the position of the moving blade 202 and the normal flow area of ​​the flow channels increases continuously in both directions. Ideally, it is best to have a flow channel that is short enough while avoiding flow separation, thereby reducing flow losses. To this end, it is necessary to achieve a balance between the flow channel length and the pipe curvature. Through simulation design verification, when the axial length of the transition section (middle flow channel 201) is 3 to 10 times the blade height of the moving blade 202, the flow loss is minimized.

[0073] like Figure 2 , 3 As shown, the lowest point on one side close to the guide volute 207 is lower than the other side, and a water-discharging air-blocking valve 208 is installed at the lowest point of the guide volute 207. For liquids entering the guide volute 207 from the air chamber, rainwater entering the air turbine device 200 on rainy days, and sea waves entering the turbine from the guide vanes, the height matching of the "I"-shaped air turbine device 200 and the guide volute 207 is used to achieve liquid drainage to the lowest point of the guide volute 207, and the liquids are discharged in time through the water-discharging air-blocking valve 208 to prevent water from entering the moving blades 202 and causing damage to the blades.

[0074] When encountering severe sea conditions, the flow pressure in the air chamber exceeds the design value of the turbine power generation system. The system is equipped with positive and negative pressure relief valves to maintain the air flow pressure inside the power generation system below the safety threshold.

[0075] A design method for a wave energy power generation air turbine device comprises the following steps:

[0076] After the airflow changes direction through the first guide vane 203 / the second guide vane 205, it enters the first airflow channel 204 (reduction ratio a) / the second airflow channel 206 (reduction ratio b). At a certain equal blade height, the airflow velocity is decomposed into a normal velocity Vt and a circumferential velocity Vu. The airflow flows through the first airflow channel 204 / the second airflow channel 206, and the normal velocity of the airflow increases to Vt2=c*Vt, where (c is the reduction ratio a or b), and the normal velocity is calculated by the equal annular formula to obtain Vu2. At this time, the airflow angle changes to a2=arctan(Vt2 / Vu2).

[0077] The present invention adopts an asymmetric bidirectional reduction flow channel form, and Vu2 is equal at different blade heights, resulting in the airflow angle changing along the blade height direction. Therefore, in the present invention, the blade angle of the moving blade 202 changes with the airflow angle at the moving blade inlet from the blade root to the blade height. In order to reduce airflow losses, the blade angle of the moving blade 202 is usually designed to be equal to the airflow incident angle a2. In the present invention, considering that the roughness of the flow channel surface will cause the airflow to deviate toward the normal phase, the actual blade angle of the moving blade 202 is 0 to 2° larger than the airflow angle, keeping the incident airflow at an appropriate positive angle state, and achieving a higher energy conversion efficiency.

[0078] The spacing between the first guide vane 203 / the second guide vane 205 is t, the throat width is p, and the airflow angle changes from the blade inlet to the throat position is θ, which is calculated by θ=arcsin(o / p). The initial incident angle of the inlet flow of the first guide vane 203 / the second guide vane 205 is a1, and the airflow angle changes to a2=θ+a1° after being guided by the first guide vane 203 / the second guide vane 205.

[0079] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0080] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A wave energy power generation air turbine device, comprising an intermediate flow channel (201) with a built-in moving blade (202), a first air flow channel (204) with a built-in first guide vane (203), and a second air flow channel (206) with a built-in second guide vane (205), wherein the first air flow channel (204) extends from one side of the moving blade (202) to communicate with the atmosphere, and the second air flow channel (205) extends from the other side of the moving blade (202) to communicate with an air chamber, characterized in that: The flow channel area of ​​the first airflow channel (204) decreases from the first guide vane (203) to the moving blade (202), and the reduction ratio is set to a; The flow channel area of ​​the second air flow channel (206) decreases from the second guide vane (205) to the moving blade (202), and the reduction ratio is set to b; The reduction ratio a is smaller than the reduction ratio b.

2. A wave energy power generation air turbine device according to claim 1, characterized in that: The reduction ratio a is 0.2 to 0.5 smaller than the reduction ratio b.

3. A wave energy power generation air turbine device according to claim 2, characterized in that: The moving blades (202) are arranged axially and horizontally; The first airflow channel (204) comprises a first lateral channel and a first vertical channel which are connected to each other, and the first lateral channel extends in the same direction as the middle channel (201) and is connected to each other; A Bezier curve or an arc line is used to transition between the first transverse flow channel and the first vertical flow channel; The second airflow channel (206) comprises a second lateral channel and a second vertical channel connected to each other, and the second lateral channel extends in the same direction as the middle channel (201) and is connected to each other; A Bezier curve or an arc line is used to transition between the second transverse flow channel and the second vertical flow channel.

4. The wave energy power generation air turbine device according to claim 1, characterized in that: The same-direction ends of all the second air flow passages (205) are in communication with the air chamber via a guide volute (207).

5. A wave energy power generation air turbine device according to claim 4, characterized in that: The equal area of ​​the guide volute (207) decreases from the end close to the air chamber to the turbine end, and the reduction ratio does not exceed 0.

6.

6. A wave energy power generation air turbine device according to claim 5, characterized in that: The guide volute (207) or the air chamber is provided with a positive and negative pressure relief protection valve; the concave portion of the guide volute (207) is lower than the middle flow channel (201) and is provided with a water discharge air-blocking valve (208).

7. The wave energy power generation air turbine device according to claim 1, characterized in that: The intermediate flow channel (201) is arranged with equal area along the airflow direction and the flow direction, and the axial length of the intermediate flow channel (201) is 3-10 times the blade height of the moving blade (202); the moving blade (202) adopts a bilaterally symmetrical impact blade shape, and the blade angle of the moving blade (202) from the blade root to the blade height changes with the airflow angle at the entrance of the moving blade (202).

8. The wave energy power generation air turbine device according to claim 7, characterized in that: The first guide vane (203) and / or the second guide vane (205) are / is designed in an elliptical arc, and the arrangement time interval of the first guide vane (203) and / or the second guide vane (205) is adjustable.

9. A method for designing a wave energy power generation air turbine device according to any one of claims 1 to 8, characterized in that: The following steps are involved: The initial incident angle of the inflow at the guide vane inlet is a1, and the airflow angle changes to a2 after being guided by the guide vane; a2=θ+a1; θ = arcsin(p / t); Where t is the guide vane spacing in the airflow channel, p is the throat width, and θ is the change in airflow angle from the guide vane inlet to the throat position; Vt2=c*Vt; a2 = arc tan (Vt2 / Vu2); Wherein, Vt is the normal velocity of the airflow at the equal lobe height, Vu is the circumferential velocity of the airflow at the equal lobe height, c is the reduction ratio of the airflow channel; Vt2 is the normal velocity of the airflow after passing through the reduced airflow channel; The circumferential velocity Vu2 of the airflow after it flows through the reduced airflow channel is calculated according to the equal annular volume formula; The blade angle of the moving blade (202) is 0 to 2 degrees greater than the airflow angle a2.

10. A wave energy power generation device, characterized in that: The invention comprises a generator (100), a rear curved pipe float (500) and a wave energy power generation turbine device as described in any one of claims 1 to 8, wherein the generator is connected to one end of the rotating shaft of the moving blade (202), and the air chamber (300) of the rear curved pipe float (500) is connected to the air turbine device (200).

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